Valve grinding machine



my E7, 195i s. J. PETERSEN VALVE GRINDING MACHINE 5 Sheets-Sheet 2 Filed Aug. 13, 1947 larven/0? S2/22072 L/PeZ/m w July 17, i951 s. J. PETERSEN 2,559,836

VALVE GRINDING MACHINE Filed Aug. l5, 1947 3 Sheets-Sheet 5 zd/ for' Smeoyzfjpe @ase/z \I UIQ Patented July 17, 1951 UNITED arras 2,560,816 VALVE GRINDING MACHINE of Florida In my application Serial Number 'tllhiled November 18, 19.46, which issued at PatentfNo; 2,480.259, dated. August 3.0,. 1948, lthere is shown and described an improved machine .or device of this character embodying a tool carrying shaft driven by a motor .embodied in the tool,v the shaft being given an oscillatory movement during the grinding operation, and whichv will` automatically shift itself from .one position to an,- otherduring thegrinding operation, so that .the entire surface. vof theiworl being operated' upon willv beevenly ground.`

In the aforesaid device, provisionl is :made whereby the shifting thereof Will be controlled by the pressure exerted; upon .the grinding tool; by reason of its: contact With the surface beingoperated; upon, or. the .resistance createdczby' the workLupon the tool or device',l` and the' tool Iis operated from the motor throughA the medium of. aggear device.

The presentinvention is I.an.improvement.upon the prior. machine ordevicesinrfthat there: isfpro.- videdv a: clutch device in` the driving mechanism, preferably of the spring type; toprotect :from damage the unit if the gearmechanism fails to functionv properly, or if. the housing-unit. is Set too.' tight.

A furtherr object. of;` the `present invention is to provide an angle drive mechanism, to enable the user tf1-.operate with. theztoolup'onevalves that are. in a position to which it has not-.heretofore been possible to` gain. access with: the grinding: tool in. a' vertical? position, or! lwhich valve may be in aposition that-itisl dicultt'o grind.

A further. .object isi to.l `provide ant improved vacuum cup disc adapter therebyadaptinguthe tool for use inigrinding or. reseatingyalvesiwhich have been burnedor destroyed tothe-extent. that a vacuum cup .will` not: hold'to the. `valve,gthe adapter being shaped to rfit valves havingivafrious means,l such as a number ofv driving; holes,l slots or cavities inrthe top ofthe valves;

AA furtherobject is to provide animproved tool or' device of this character, whichfwillfbeoffa simple and compact i construction, easy' -to han:- dle, and effective and efficient in operation;y

ATo the. attainment ofvthese-ends and..-theac complishment of other new and useful objects as. will appear, the invention consists in the-ifeatures of novelty in substantially theconstruction; combination. and arrangement.r of. thefseveral parts, hereinafter more vfully described.AA and claimed, and Y shown in. the Y, accompanying draw-- ings, which:

Figure 1 Ais a view partly in side elevation, partly broken away, and partly in section, of. a machine or tool of this character embodying this invention..

Figure 2 is an` exploded view of some of the parts vshown in Figure 1.

Figure 3 is a detail sectional View, on an enrlarged scale, of the clutch mechanism.

Figure. 41S an enlarged detail Se'iieel View online 4 4, Figure l.

Figure 5 is a plan view of support for .the driving assembly.

Figure 6l is an. exploded view o f the parts showgirl Figure Figure 'l is al detailsecticnal View ofanother form of clutch device.

Figure S is a sectional View of an angle drive vacuum cup adapter.

Figli-1re 9 isa detail sectional view of a vacuum cup driving disc adapter.

Figures 10, v11 and 1,2 are views of `the driving. disc adapter.

Referring more particularly to the drawings, the device consists essentially of a casing or housing. .15, in which is located. a motor having adriving shaft it, the motor being supplied-with cur-rent from any suitable source, through-.the medium of a conductor Il, and4 is controlledin itsoperation by means of ak suitable switchqdevice i8. Within rthe motor casing- I5, isa wall onpartition I9, provided with a portion 2 0 ,formingafbearing4 throughwhich.` the shaft `Iii passes; Seated in the housing andv spacedfrom the 4wall thereof, preferably by means of an ,internal flange 21, is a rotary drive ring gear 122; fthe teeth 220.gif which areA beveled and-encompass the shaft IB. rIhe gear is providedwitha recess. 22h-which receives a projection- 22e, .on the Wall I9, for maintain the'ring.gearimposii tion andfor maintainingit against rotationrwith respect tothecasing;

`A pinion gear-23;v -is1 secured: to the .shaft .161; preferablyv beyond4 the ring gear `221. Supported byl the l housing I5, is ay support,I preferably of sectionalconstruction and embodying. .twoasections 24, 25, whichlatter may beconnectedato'- getherin any suitablemanner such asgbyan'ia'ns of.a threadedjoint X26;

.Thewsection 24; is` provided V with` a ,wall-2:13 inV whichisjournaled a series-of shaftspgn'i and-353, `-theshafts being. journaled'in Vsuitable extension vbearings 3 l. To the shaft? 28;l is se# cured ag earl-32, which-mesheswitw aV pinion gear 33that is .carriedjby aggearil on.=theshaft 29. To the shaft 33,- is connected a pinion 35,

3 that is carried by a gear 36, and which pinion meshes with the gear 34.

The pinion 23, meshes with the gear 36, so that when the motor shaft I5 is rotated, the desired speed of rotation will be imparted to the shaft 2S, through the medium of the intermediate gears.

Connected to the shaft 28 is a crank 31, having a projecting pin 38, which latter projects into a bifurcation or slot 39, in a crank arm 53, that is carried by a shaft 5I. All of the gear mechanism thus far described is disposed within the section 2d of the support, and all of such gear mechanism, including the cranks 31 and 43, with the exception of the gear 23, that is carried by i the motor shaft, are removable with the support as a unitary structure.

The bottom section 25 of the support is provided with an extension 62 forming a bearing for a shaft Ill. Within the section 25, and through which section the shaft III projects, ball bearings MI, 35 are provided, which are spaced from each other and in which bearings this shaft is journaled.

The support embodying the sections 24, 25, o

is rotatably held in position with respect to the casing I5, in any suitable manner, and to that end the support telescopes into the lower end of the casing I5, so as to be disposed adjacent the flange 2`I, and a retaining collar IIS is threaded into the end of the casing and engages under a peripheral flange 131, on the section 2li.

Disposed between the upper end of the section 2li and the flange 2I in the casing I5 is an annular member I8 having a peripheral flange 45 and which flange projects between the end of the collar 26 and the flange 2l. This member i8 telescopes into the upper end of the section 25, and is maintained against rotation with respect thereto, in any suitable manner such as by means of an anchor pin 50.

Carried by the member [i8 and disposed transverse to the axis of the member is a stub shaft 5I, which is fixed with respect thereto. This shaft is of any desired length and sleeved thereon .1.

is a bevel gear member 52 preferably having a sleeve extension :53, and is rotatable on said shaft. Said gear has associated therewith a clutch friction plate 54. Rotatably mounted upon the sleeve 53 and disposed to cooperate with the friction plate 54, is a worm gear 55, which is also provided with a tubular extension 56, the side 51 of the gear being adapted to engage the plate to create friction therebetween. A retaining washer 58 is mounted upon the sleeve 55, and a spring pressure plate 59 is mounted upon the extension 53 of the gear 52. A spring EI! of any suitable construction is mounted upon the end of the sleeve 53, and operates to create friction with the plate 54.

The spring 5I] is sealed in a recess 6I in the sleeve 53, and a cotter pin 52a seated in an opening 5W in the shaft 5I holds the parts assembled. The shaft 5I is so positioned that the gear 52 meshes with the ring gear 22, and the worm gear 55, meshes with a worm 62 carried by an extension 53, on the end of the shaft 28.

When the motor is operating, the shaft I5, will be rotated to rotate the gear 23, and this gear will rotate the gears 36, 35, 34, 33, and 32,

4 to the direct gear connection with the motor through Worm 52, worm gear 55, bevel gear 52 and ring gear 22, and will not depend upon resistance or pressure exerted upon the work.

In order to prevent damage from being done to the rotating assembly, the clutch mechanism is provided. The spring clutch is engaged at all times, and is driving the unit forwardly, and the tension or friction created therein, is such that it cannot slip backwardly.

The object of the clutch is that in case rotation is prevented in any way, damage is prevented, that is the power applied to the rotating gears will allow the clutch to slip, thus allowing the rotating unit to be stalled with no damage to the rotating assembly; the gear ratio is such that a great gear leverage is created.

In Figure '1, there is shown a modified form of clutch mechanism, wherein the worm gear 63, which corresponds with the gear 55, is provided with a slotted hub 64, to provide spring ngers which are depressed so as to frictionally bind the gear upon the sleeve or extension of the gear 52, and a suflicient friction will be created to make the clutch operate properly.

In order to adapt this tool or device for use in any type of car, wherein the motor is mounted back against the cowl, or so close to a wall or abutment, that it is not possible to grind the last valve with the grinding tool in a vertical position, there is provided an adapter which embodies two sections 85, 66 which are connected together by means of a universal joint or coupling 61a. Carried by the free end of the section 85, is a disc G1 having a peripheral flange 58 which is engaged by a suction cup 69, carried by the tool shaft 4I. To the free end of the section 66 is connected, in any suitable manner, a suction cup 19, that engages the valve 13, to rotate the latter upon its seat.

i not hold to the valve.

The section 56 is journaled in a housing 12, by means of ball bearings 13-14. A flange 15 which forms an integral part of the section 66 rests against one end of the housing, and an adjustable nut or collar 16 engages the other end of the housing 12.

In use, the motor casing or housing I5 is held in one hand while the adapter housing 12 is held in the other hand, during operation of the tool or device.

, is shown as being in a condition that the suction cup 19 will suiciently grip the same so that the valve can be rotated on its seat.

Many valves however, are slotted as at 5U, and are burned to the extent that a suction cup will In such instances an adapter 8|, is provided with a projection 82, adapted to be seated in the slot 80, thus connecting the adapter directly to the valve. The suction cup 69, is then applied to the adapter, and the valve can then be ground. In some instances the valves are provided with two holes drilled in the head for driving the valve. In this instance the adapter 83, is provided with two pins or projections B4, to project in said holes.

While the preferred forms of the invention have been herein shown and described, it is to be understood that various changes may be made in the details of construction and in the combination and arrangement of the several parts, withthe shaft, means connected between the supportv and the shaft for imparting a rotary motion to said support while the shaft is oscillating, and friction clutch means associated with said last named means normally operable to drive rotatably said support, but adapted to slip under conditions of excess resistance to the operation of the shaft to stop rotation of said support and prevent injury to the oscillating means between the motor and shaft.

2. A portable valve grinding device including a rotatably mounted support, a tool carrying shaft supported thereby for movement therewith and for oscillatory movement with respect thereto, a motor, an operative connection between the shaft and the motor for oscillating the shaft, means connected between the support and the shaft for imparting a rotary motion to said support while the shaft is oscillating, and a friction clutch in the last said connection, said clutch being of a strength to maintain the support against retrograde movement.

3. A valve grinding device including a motor, a support rotatably mounted with respect to the motor, a tool carrying shaft mounted upon the support for bodily movement therewith and for movement with respect thereto, means operatively connecting said shaft with the motor for moving the shaft with respect to the support, a driving connection between the shaft and the support to cause the support to be rotated, and a frictional clutch device embodied in the last said connection normally operable to drive rotatably said support, but adapted to slip under conditions of excess resistance to the operation of the shaft to stop rotation of said support and prevent injury to said driving connection.

4. A valve grinding device including a motor, a support rotatably mounted with respect to the motor, a tool carrying shaft mounted upon the support for bodily movement therewith and for movement with respect thereto, means operatively connecting said shaft with the motor for moving the shaft with respect to the support, a driving connection between the shaft and the support to cause the support to be rotated, and a frictional clutch device embodied in the last said connection, the said clutch device embodying a gear and a worm gear, the axes of rotation of said gears being disposed transverse to the axis of the said shaft.

5. A valve grinding device including a motor, a support rotatably mounted with respect to the motor, a tool carrying shaft mounted upon the support for bodily movement therewith and for movement with respect thereto, means operatively connecting said shaft with the motor for moving the shaft with respect to the support, a driving connection between the shaft and the support to cause the support to be rotated, a frictional clutch device embodied in the last said connection, the said clutch device embodying a gear and a worm gear, the axes of rotation of said gears being disposed transverse to the axis of the said shaft, and a ring gear meshing with the rst said gear for rotating it.

6. A valve grinding device including a motor, a rotatable support, a tool shaft bodily movable with and also movable with respect to the support, a drive connection between the motor and said shaft for actuating the shaft with respect to the support, said connection embodying a crank shaft, a drive connection between the crank shaft and the support for rotating the latter, the last lsaid drive connection embodying a safety clutch device automatically releasable under excessive resistance to the operation of the tool shaft, said clutch embodying a driving gear and a worm gear connection between said driving gear and said crank shaft, and an annular stationary gear with which the said driving gear that is associated with the worm gear meshes.

7. A valve grinding device including a motor, a support rotatable with respect to the motor, a tool shaft journaled in the support bodily movable therewith and movable with respect thereto, a driving connection between the motor and tool shaft for operating the latter with respect to the said support, said connection embodying a crank shaft, a driving connection between the crank shaft and said rotatable support for rotating the latter, the last said driving connection embodying a worm gearing between the crank shaft and the rotatable support, and a spring biased friction clutch device for controlling the rotation of said support.

8. In a valve grinding device, a rotatably mounted support, a tool carrying shaft journaled therein, means for oscillating the shaft with respect to the support, means connected between the first named means and said support for rotating said support while the said shaft is being oscillated with respect to the support, and a clutch device associated with said last named means automatically operable under conditions of excess resistance to the operation of the shaft to stop rotation of said support and prevent injury to the oscillating means, the said clutch device embodying driving means and driven means carried by the rotatable support, said driving means having frictional driving engagement with said driven means under load conditions less than said conditions of excess resistance to the operation of the shaft.

9. A valve grinding device comprising a housing, a motor mounted in the housing and having a motor shaft extending through said housing, a pinion secured to said motor shaft, a ring gear ixedly mounted on said housing, a support rotatably mounted on said housing, a first shaft journaled in said support and having its axis out of alignment with the axis of the motor shaft, a gear secured to said first shaft, gearing drivingly connecting said pinion with said gear, a worm mounted on said first shaft, a second shaft carried by said support and arranged at right angles to said first shaft, a bevel gear rotatably mounted on the second shaft and meshing with said ring gear, said bevel gear having a sleeve extension on which is formed a clutch friction plate, a worm gear rotatably mounted on the sleeve extension of said bevel gear and meshing with said worm, a spring for urging a surface of said worm gear into frictional driving engagement with said clutch friction plate, whereby rotation of the motor shaft will cause said support to rotate with respect to said housing, a tool carrying shaft rotatably mounted in said support and arranged in axial alignment with the motor shaft, a crank arm at one end of said tool carrying shaft and having a slot formed `by the slot in said crank, and a valve engaging suction cup at the other end of said tool carrying shaft.

SIMON J. PETERSEN.

REFERENCES CITED The following references are of record in the le of this patent:

8 UNITED STATES PATENTS Number Name Date Peterson Deo. 29, 1914 Leggett Nov. 13, 1917 Miller Nov. 5, 1918 Burke et a1. May 10, 1921 Burke et a1 Jan. 3, 1922 Gairing Nov. 10, 1931 

